Gas-engine sparker.



A. P, TALLMADGE, GAS ENGINE SPARKBR.

APPLIoAToH Hun mums, 1905.

@witnesses UNITED STATES PATENT OFFICE.

ANDREW P. TALLMADGE, 0F WASHINGTON, DISTRICT OFCOLUMBIA.

GAS-ENGINE SPARKER.

Na `arcsec.

Specification of Letters Patent.

?a.tented Feb. 27, 1906.V

To all whom it lmay concern:

Be it known that I, ANDREW?. TALLMADGE, a citizen of the United States.residing at Washin ton city, District ol Columbia, have invente certainnew and useful Improvements in Gas-Engine Sparkers `and If'do herebydeclare the followin to be a full, clear, and exact description o theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to certain improvements in sparkin devices forexplosive-engines; and the objects and nature of my invention will bereadily understood b thosel skilled-in the art in the light of thefollowing explanation of a construction shown in the accompanyingdrawings as an exam le from among other arrangements within tlie spiritand scope ofcmy invention.

It might he here stated that an the ,invention is to provide an excemlysim le improved device which can be rea i y aP novpv in use and'whereby the sparks can be easily and uickly advanced or the sparkingdevice can e so set as to cause the sparks to occur at the desired timewith relation to the movement of the piston.

The invention consists in certain novel features in construction and inarrangements or combinations of arts, as hereinafter more fully setforth anniJ explained.

eferring to the accompanying drawings, Figure 1 is an elevation of theWorking parts `of a sparking device including my invention,

the cylinder and other working parts'of the engine not being shown. Fig.2 1s a detail or detached perspective view of In device or attachment`Fig: 3 is a longitu inal sectional view of the device or attachmentshown in Fig. 2. l

My attachment yor device is particularly adapted f or use onthestationary ex lesiveenglne such as disclosed by Unite States PatentNo. 7 46,406, issued December 1963, to J. S. Thurman, and in thedrawings l'have shown only the connections or means for ac- I tuatingthe sparking points. In the engine of said patent a sw and reciprocatingrod carries a trippingog to periodically trip means for moving the movabe sparki point. This actuating-rod is slidable throngV a rockingoroscillating guideblock Vor head, which practically constitutes thefulcrum for guide-block conied to certain types of explosive-engines Ytains a spring-held` follower" pressedY towardV the .rod to permitoutward 'eldin thereof in case of accidental back t row o the'engine;but the block has no means for-shifting the fulcrum-point of theactuating-rod Vfor the purpose of advancin the spark; My attachment issubstitute for said oscillatin ide-block of the patent just referred toand is provided with means for changing the fulcrumor position ofl saidactuating-rod to vary the time of the spark with respect to the positionof the piston of the engine.

'In the drawings, 1 is a. plate secured to the head of theengine-cylinder, (not showin) and this plate carries the rod 3'projecting into the cylinder to form the stationary sparkin point, andalso the rocking shaft 5, Whic Within the cylinder is rovided with themovable sparking point, not showm) coperati'ng with said stationaryoint, as in sai patent, to produce the spaiilr on the separation of thetwo points.

7 is an arm rigid with the rocking shaft 5.

11 is an arm loose on shaft 5 and at one Vend having extension 13,bearing against expansion-spring 14. At its opposite end armll isprovided with the projected end or finger 12 and with a lateralextension 17, to the outer end of which retractile spring 18 is secured,the op `osito end of said sprin 18 being secured to t e arm 7 toyieldingly old a lateral projection of said arm 7 a einst the arm 11.The spring 14 yieldingly olds the arms 11 and 7 iny their normalpositions, (see Fig. 1,) with the arm 7 against buffer 9 of rigid stud10. Y

` 22 is the actuating-shaft .for the sparking device, and 20 is theactuating-rod reciprocated and swung by said shaft and at one end havingeccentric connection with said shaft throu h the medium of a crankarmand pin 211. he actuatin -rodis provided with the :tripping-dogv 19, )v'ch has an elliptical path ofmovement and is adapted to engage theprojecting end or finger 12 and move the same to contact the sparkingpoints.

`23 is a stud projecti from the plate 1, and 24 is arocki i orpsci atingblock mounted to rock on sai stud, any suitable means being provided toconfine said` biock on said stud. At one end the block 24 is formed withthe journal or boerin hole or npc .125, extending therethroug to receivesai stud 23.

The block is elongated and formed withha longitudinal slidcway open atthe opposite sides of the block and closed at its outer end by a plate26, secured to the ends of the opposite side walls of the block.

27 is a guide-box for the actuating-rod 2O and through which the samereciprocates. This box 27 extends transversely through said slideway ofthe oscillating block 24 and is loosel confined therein and adjustablelongitudinally thereof. This box 27 is prefera ly recessed across itsside edges to receive the opposite side walls of the block 24 and toform shoulders fittin .the longitudinal edges of said side walls to ho dthe box against transverse movement in the block. The box` Abox 27longitudinally of the oscillating block to vary the position of thetripping-dog 19 with respect to the rojecting end or finger 12 and tohold or locl said box in the desired position. As an example of meanswhich can be employed for this purpose I show a screw-threaded rod 31arranged longitudinallyof the block and passing loosely through the late26 and at its inner end rigid with the ox 27.

32 is a wing-nut at the outerface of late 26 and screwed on the outerend o the threaded rod 31 and by means of which the threaded rod and thebox can be moved longitudinally of the oscillating block. 33 is an exansive spring coiled around the threaded ro and compressed between thebox 27 and the plate 26 to hold the nut 32 and the box in pro er ositionand to force the box inwardly of t e s ideway when the nut is unscrewedor loosened.

i If desired, .the late 26 can be formed with a series-of radia groovesor depressions 34 "around the openin for the threaded rod and the nutwith a ra ial rib or edge 35 to fit in any one of said grooves, andthereb lock the nut in the desired adjustment an `whereby the adjustmentcan be more accurately effected and determined as the rib snaps fromgroove to groove.

In Fig. 1 the box 27 is Ashown adjusted i about to normal osition tocause the engaging end of the tri ping-dog to travel in the elli ticalpathindicated by the lower dotted patli' and in the direction of thearrows and so that the dog willengage the finger 12 and swing the sameto the left, and thereby swing the arm 7 and brin the movablesparkingpoint into contaht with the xed point and so that the dog will slip pastnger 12 about at the dotted line b, and thereby permit the arms andmovable point to return to normal position, thereby causing theigniting-spark.

lf the engine speeds up so that it becomes desirable to econoinize fueland attain maximum power by advancing the spark, it is merely necessaryfor the operator to turn the nut 32 in a direction to move the box 27outwardly the desired distance to cause the dog to trip the finger 12 atan earlier point in its path. For instance, the box 27 can be adjustedoutwardly to cause the engaging end of the dog to `move in the upperpath shown by, dotted lines in Fig. 1, in which the dog will trip at thepoint a, thereby advancing the spark with respect to the movement of thepiston.

lt is obvious that by employing my attachment a wide range of adjustmentis provided. for either retarding or advancing the spark to suit variousconditions and tnat the construction is exceedingly simple and durableand very easily operated.

The attachment can be applied to various types of engines and can bevery readily applied to engines of the Thurman type now in use by simplsubstituting my attachment for the guidelock of the Thurman engine.

It is evident` that various changes and modifications might be resortedto in the forms, arrangements, and constructions of the parts describedWithout departing from the spirit and scope of my invention. Hence I donot wish to limit myself to the exact construction shown.

What I claim is-4 1 As an article of manufacture,ithe sparkadvancercomprising a block adapted to be mounted and rock on a journal andhaving a longitudinal slideway, a box through which thesparker-actuating rod is adapted to reciprocate, said box confined insaid slidewa j, and means for adjusting said box longitu 1- nall of saidslideway and holding the same in the desired adjustment, substantiallyas described.

2. An explosive engine spark advancer com risin a block having a bearingon which the lock 1s adapted to oscillate, a box conlined to and movablelongitudinally of said block, said boxhaving a bore through which thesparker-actuatiiig rod reciprocates,- and a threaded ro'd and nut foradjusting said. box and holding the same inthe desired positionlongitudinally of theblock.

3. A s ark-advancer comprising -a block having a earing on which theblock is adapted to oscillate with a swingingand reciprocatingsparker-actuating rod, said block having a lon itudinalslideway, a boxAconfined in said slieway to slide longitudinally thereof and having abore receiving and through which said rod reciprocates, a threaded rodfor moving said box in one direction and extending longitudinally of theblock, a spring yieldingly .slidewayand formed with a longitudinal boretherethrough, said box being formed. of longitudinal seotions removablyseoured together, a threaded rod t 'inlined to said box and extendingoutwardly through said plate, a. spring compressed between said plateand the box, and a nut on the outer end of the Azo rdat' the outer faceof said plate.

5. In an explosive-engine, in combination, sparking mechanism, areciprocating and swinging actuating-rod provided with a tripping dogfor aetuatin said mechanism, means for actuating sai rod, and anoseillating bleek provided witha box in whieh said rod is confined andthrough which the same reeiproeates, and rmeans for moving said box tomove said rod laterali and for looking the same in the desiredadJustment.

6. In an explosion-engine igniter, a. movable electrode, an oscillatorytripped member, a reciprocating engine operated tripping-rod, a guidingbearing-box surrounding said rod, e rocking block carrying said box, andprovisions for shifting said box laterally with respect to the path ofmovement of the rod.

Inftestimony whereof I aix my signature in presence of two witnesses.

' ANDREW P. TALLMADGE.

